Roller guide



July 5, 1932. J. us 1,866,149

ROLLER GUIDE F-iled Aug. 13, 1929, 2 SheetsSheet l jwoentoc as, Daw'dJbinw' I c'lttow July 5, 1932, BINUS 1,866,149

ROLLER GUIDE Filed Aug. 13, 1929 2 Sheets-Sheet 2 gwomtot UN b STAPatented July 5, 1932 I :7.-

DAVID J. BINUS, OF CANTON, O HIO, se ment rHE WEBER DENTAL.MANIITFACTIQIB-I ING COMPANY, or CANTONpOHIO, A CORPORATION-JOE OHIOROLLER GUIDE;

Application filed e is, 192 9. Serial no. 385,616.

My invention relates to roller guides more particularly for use inconnectionwith the telescoping sleeves of dental chair elevatorsandthelike.'

Such elevators may include "a plurality of telescoping sleevesor'hou'sing sections, and it is necessary to prevent thesleeves fromrotating with respect to'each'other in order to maintain the requiredlongitudinal alin'ement of'the elevator'parts, and it has been foundthat'mere interfittingsli'ding guides are diiiicult and expensive tomanufacture, and are'subjectto excessivefriction, causing wear of thesliding surfaces, and are further more very'diflicult toprovidewithsuitable adjusting means for taking up the wear.-

Accordingly the objects of the present invention includesthe provisionof improved roller guides for use between two members longitudinallymovable with respect to each other, such as the telescoping: housingsections of a dental chair elevator, and toprovide novel adjustingmeansfonsuch roller guides. V These and ancillary objects are attainedin the present invention, as will hereinafter be set forth in detail andclaimed, and which 7 may be stated in generalterms as including thecombination with two members 1 ongi-' tudinally movable with respect toeach other of a longitudinally extending rail preferably removablysecured on one member,-'one' or more shafts mounted"; on the othermember and extending cross-wise of the rail, and a pair of preferablyconically' shaped rollers rotatably mounted on each shaft with theapexes of the rollers adjacent each other for rolling on opposite sidesof the guide member,

anti-friction thrust bearingslfor the rollers, and means for adjustingthe spaclng of the rollers on the shaft. e

A preferred embodiment of the invention is illustrated in theaccompanying drawings forming part hereof, in which Figure 1 is afragmentary elevation view of a telescopic elevator for a dental chalrorthe like, portions of the intermediate telescopic member of theelevator being broken'away and illustrated in section on the verticalplane A passing through the axes of the roller guide shafts at one's ideof the intermediate memberand'looking in the-direction of the arrowsa-a, Fig; 2, and portions of the lower telescopic member of the elevator:being broken away and illustrated in section on the vertical'planeB'p'assing through the axes of the roller guide shafts at one side ofthelower telescopic memberand looking in thedi rec tion'of the'arrowsZ246, Fig. 2; and 7 section on the horizontal plane, C passing through,the opposite upper roller" guide shafts of the intermediate telescopicmember and looking in the direction of the jarrows cc,'Fig. 1, andportions being broken away 2 a fragmentary plan view thereof, portionsbeing broken away and illustratedin and illustrated in Section on thehorizontal plane vD passing through theaxes or the oppositeupper rollerguide shafts of the lower telescopic member and looking tion ofthearrows dd,jFig. 1'. Similar numerals refer to similarpa rt's'throughout the drawings; The dental chair elevatorindicated' generallyat 10, includes abase 11, a lower telescopic'member, "12supported by thebase, an

intermediate telescopic-niember 13 longitudinally telescoping within thelower member 12,-"and an. upper telescopic member 14 longitudinallytelescoping within the inter-j mediate-member 13. v .1

At the upper end of the upper memberrl i,

mu direc'i the seat 15- of a dental chair "may bezsup 3'. r r l. r t

I All of the foregoing members are hollow, and house suitable mechanismnot shown, but which may be-thatfillustrat'ed in the prior applicationfor patent offHenry E. Weber,

for dental chair elevators, filedNovember 3, 1928, Serial 316,969, whichmatured into Patent No. jl,814,8(4,} issued July 14:, 1931 whereby thetelescopic members be raisedbybperation of an elevating'pedal lever 16,andmay be lowered of 'ajlowering pedal lever-"17R 'In raising andlowering the i telescopic br w e-e members of the elevator, it is,necessary w prevent rotary movement of the members with respect to eachother." i 'One' member of eachpair of thetelescopi has formed therein ahorizontal laterally ing members is provided preferably at oppositesides with longitudinally spaced sets of roller members and theiradjustable mount ings, each set being illustrated generally at 20, andeach set comprising one cooperating instrumentality of the improvedroller guide I hereof.

For example, the upper set of roller members and mountings 'on theintermediate member 13, as viewed in Fig. lfwill be described in detail,'each of' the other sets being of substantially identical construction.

' This set together with the longitudinally spaced lower set at thatside of. the inter.-

; mediate member 13 cooperates with a longitudinally extending rail 21which is pref-V erably a circular rod, removably-secured as by screws 22in an outer groove formed in the upper telescopic member l4.

d A similar rail 21 is mounted on the upper member 14 opposite thefirstmention'ed rail, and similar opposite rails are secured inlongitudinally extending grooves onthe out er surface of theintermediate member 13 I Y and cooperate with longitudinally spaced setsof the roller members and adjustable mountings 20 secured in oppositesides of the lower member 12.

Referring to the particular set 20 under consideration, the intermediatemember 13 extending bore 23. The bore 23 is threaded at itsj centralportion24eand the walls of the member'13 have an inner side opening 25formed therein, communicating with the inner end of the bore, and intowhich side opening the rail 21' extends.

he bore 23 is provided with an inner end extension 26 of substantiallyreduced diameter, and the innerbore extension 26 forms a bearing for oneend of. a roller shaft 27 ,The roller shaft 27 extends transverselycross-wise of the rail 21 and its other end is supported in. a bearingbore 28 formed in r a screwplug-29 whichjis adapted to screw in thethreaded central portion '24:. of the bore 23., c V I V g At oppositesides of the rail '21 preferably conical rollers 30a and 30?; arerotatably mounted with their apexes adjacent each other and with theirconical surfaces rolling against opposite sidesof the rail 21.

- A preferably anti-friction thrust bearing 31a is interposed betweenthe base end 32a of the conical roller 30a and one surface of athrustdisk 3300 which is seated against the shoulder 34a formed betweenthe inner end tension 26. j I V Similarly a preferably anti-frictionthrust of the enlarged bore 23 'andt'he reduced ex bearing 31?) isinterposed-between the base end of the screw plug-29.

By screwing the vplug 29 towards -or away I end 326 of-the conicalroller30b and a' thrust d1sk'y33b which is seated against the inner from theroller members, the distance between their opposite conical surfaces isdecreased or increased, and the rollers are arranged to rolllongitudinally on the rail with no sliding friction, forming theimproved adjustable roller guide hereof.

wear on either the "rail or the rollers may e taken up by suitableadjustment of the screw plug 29.

A set screw 3'5' sc'rewed in a suitable aper ture in the member 13and'engaging with the screw plug 29 secures the set of roller members inany desired position of adjustment.

"' A 'iille'r p1ug'3 6' may be provided if desired for the outer end ofthe bore 23."

I claim Y v1. Incornbination, two telescopic members longitudinallymovable with respect to each other, a longitudinally extending railsecured onone member, spaced rollers movable with respect to each otherandv rotatably mounted on the other member, and means for moving saidrollers with respect to each other thereby maintaining opposite faces ofthe rollers in rolling contact against opposite member and extendingtransversely of the rail, spaced rollers rotatably and slidably mountedon the shaft and rolling against opposite sides of. the rail, and meansfor sliding'said rollers onsaid shaft toward each. other. V

In .testimonythat Ilclaim the above, I have hereunto subscribed my name.v

DAVID J. .BINUS.

